Phosphorus pentachloride decomposes at higher temperatures.

PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)

An equilibrium mixture at some temperature consists of

3.03 g PCl₅, 208.23 g/mol
4.86 g PCl₃, 137.33 g/mol
3.59 g Cl₂, 70.91 g/mol

in a 1.00-L flask.

If you add 1.31 g of Cl₂, how will the equilibrium be affected and what will the concentration of PCl₅ be when equilibrium is reestablished?

shift left

shift right

no shift will occur

[PCl₅] =   mol/L

When the following skeletal equation is balanced under basic conditions, what are the coefficients of the species shown? SiO32- + Br- --> Br2 + Si Water appears in the balanced equation as a (reactant, product, neither) with a coefficient of . (Enter 0 for neither.) Which species is the reducing agent?

When the following equation is balanced properly under acidic conditions, what are the coefficients of the species shown? Ag+ + Mg-->Ag + Mg2+ Water appears in the balanced equation as a (reactant, product, neither) with a coefficient of . (Enter 0 for neither.) How many electrons are transferred in this reaction?

A student performed the synthesis of aspirin. After weighing their product, they had 0.501g of product. They took 0.250g of this product and diluted it to 250mL as instructed, and then used 10ml of that stock solution and diluted it to 100mL with 0.025 M Fe(NO₃)_3.Upon analysis with a Spectrophotometer, that solution was found to have an absorbance of .150. Using a Beer's Law plot with the equation A=0.250xC where A is absorbance and C is concentration (1x10^-5M), determine the percent purity of their sample.

I am really struggling with this chemistry problem. I don`t even know how to start..

The problem is about recrystallization:

Two crystalline compounds x and y have the same solubility ratio in water( the solubility is: 1 g/100 mL at 20 degree celsius and 10 g/100 mL at 100 degree celsius) In this example we predict that if the x and y compunds is in the mix, they have the same solubility ratio.

1. From a mix of 10 g x and 1 g y shall clean/pure x be extraxted. How much clean x can we get after a recrystallization?

2. How much clean x can we get after a recrystallization if the mix consist of 10 g x and 8 g y?

Would really appreciate some help:)

for the following compounds:

i) give the correct name and indicate the possible isomers for parts (d, f, g,h,j)

ii) determine the dⁿ configuration, coordination number for the metal and electron count according to the 18 electron rule

iii) calculate the spin only magnetic moment

a) K [Mn(CO)_5]   b) H[AuCl₄]

c) Na[n²-C₂H₄)PtCl₃] d) [(n⁶-C₆H₆)₂Cr]

e) K₂[PdCl₄] f) [Ru(H)(Cl)(CO)(PPh₃)₃]

g) [Co(NO₂)(NH₃)₅]SO₄ h) [CoCl(en)(NH₃)₃]Cl

i) [Ir(phen)(Cl)₄] j) [Cr(en)₃]Cl₃

Construct the titration curve, for the titration of 50.0 mL of 0.125 M trimethylamine with 0.175 M HCl (aq).

A. Calculate the initial pH of the solution in the flask.

B. Calculate the pH after 15 mL of titrant is added.

C. Calculate the pH at the equivalence volume.

D. Calculate the pH after 45 mL of titrant is added.

E. Calculate the pH after 60 mL of titrant is added.

Please show all work

Consider the diprotic acid H₂X, where K_a1 = 1.75 x 10^-5 and K_a2 = 4.3 x 10^-12 at 25 °C. The concentration of HX^- (aq) in a 0.125 M solution of H₂X at 25 °C is approximately

• A. 2.0 x 10^-5 M
• B. 4.5 x 10^-3 M
• C. 1.5 x 10^-3 M
• D. 3.5 x 10^-5 M

• E. none of these

The sulfur in a 5.00 g sample of steel was evolved as H₂S and then collected in a solution of CdCl₂ to produce the precipitate CdS. The CdS was then titrated with excess I₂ and the remaining I₂ was then back titrated with 4.82 ml of 0.0510 M sodium thiosulfate. If the concentration of the I₂ is 0.0600 M and a total of 10.0 ml is added, calculate the %S in the steel.

The relevant reactions are:

CdS + I₂ -> S + Cd²⁺ + 2I^-

I₂ + 2S₂O₃^- -> S₂O₆^2- +2I^-

2) (40 pts) An alligator that has been warming in the sun swims into cold water. Calculate the following parameters, if the alligator temperature (underneath the scales) is 33 °C and the water temperature is 15 °C. Assume the pathway for heat transport is through the thick scales (with conductance of 0.5 mol m-2 s -1 ) and then through a thin boundary layer in the water (with conductance of 1 mol m-2 s -1 ). Ignore radiative effects and view factor considerations, and assume there is no fluid movement, just diffusion (ie, no forced or free convection).

a) What is the total conductance to heat loss?

b) What is the convective heat loss in Watts per square meter?

c) Now imagine that a python swallows the alligator whole, and that the python has a resistance to heat loss of 3 m2 s mol-1 . What is the new total conductance of the alligator-python combination to heat loss? (hint – this just adds a third series element to the conductances – assume the boundary layer conductance still applies and does not change).

d) What is the new convective heat loss from the alligator to the water (through the python)?

e) How would your answer to c) change if the python’s resistance was a parallel combination of 3 m2 s mol-1 through the spots, and 15 m2 s mol-1 through the spot-free areas?

f) What is the convective heat loss in e)?

What is the oxidation number of the following elements when they form ions?

1. Se

2. Li

3. Al

4. P

Consider the following liquids with similar molar masses. Predict which has the weakest intermolecular attraction based only on boiling point data.

butane (Bp @ 760 mm Hg = -0.5 °C)

ethyl chloride (Bp @ 760 mm Hg = 12 °C)

propyl alcohol (Bp @ 760 mm Hg = 97 °C)

acetic acid (Bp @ 760 mm Hg = 118 °C)

ethyl methyl ether (Bp @ 760 mm Hg = 11 °C)

The heat of solution of potassium acetate (KC₂H₃O₂) in water is -15.30 kJ/mol.
If 19.70 g of KC₂H₃O₂(s) is dissolved in 600.0 mL of water that is initially at 24.50 °C,

What will be the final temperature (in degrees Celcius) of the resulting aqueous solution?
(Assume no heat exchange with the surroundings.)

Consider the titration of 50.0 mL of 0.130 MHNO3 with 0.450 M NaOH.

How many millimoles of HNO3 are present at the start of the titration?

How many milliliters of NaOH are required to reach the equivalence point?

What is the pH at the equivalence point?